Which of the following presented the greatest challenges to the united states after world war i? 2. african americans who served in world war i returned home to find? 3. which of the following statements characterizes race relations in the aftermath of world war i? 4. in which of the following cities was the prosperous greenwood district burned down in racial riots in 1921? 5. which of the following factors contributed to the incredible number of militant strikes that occurred during 1919? 6. which of the following politicians won tremendous political support during the strikes of 1919, when he claimed, "there is no right to strike against the public safety by anybody, anywhere?